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Many people thing farming is just like gardening, just on larger scale. It's not - farmers plan soil rotation for decades. And as already explained, *any* crops currently in use is GMO and has been for thousands of years. The fact that Greenpeace lobbied calling GMO developed after 1980 "the GMO" is just a manipulation.
Regarding soil etc I can only recommend Talking Biotech podcast as they discuss it all the time http://www.talkingbiotechpodcast.com/